Which of the following processes occurs during repolarisation of nerve fibre? (i) Open \[N{{a}^{+}}\] channel (ii) Closed \[N{{a}^{+}}\] channel (iii) Closed \[{{K}^{+}}\] channel (iv) Open \[{{K}^{+}}\] channel

• A. (ii) and (iv)
• B. (i) and (iii)
• C. (ii) and (iii)
• D. (i) and (ii)